Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
CA 03016705 2018-09-06
DESCRIPTION
CORK THREAD, OBTENTION METHOD AND USES THEREOF
Technical field
[0001] The present disclosure refers to a cork thread, in particular a thread
with incorporated
cork, textile structures comprising said thread, obtention method and uses
thereof.
[0002] The cork thread described in the present disclosure is useful to the
textile and clothing
industry, and can be applied extensively in the textile industry namely in the
manufacture of
fabrics for clothing and household textiles, in particular technical clothing,
duvets, blankets,
covers, etc.
Background
[0003] The current market offer is devoid of textile substrates with
incorporation of high
quantity of chemically bound cork. There is in the market a vast range of
products named cork
fabrics and cork threads, used in textile products and leather goods, but that
in reality are
found to be thin sheets of natural or agglomerate cork (usually with a
thickness in the order
of millimetres) laminated with fabrics and non-woven fabrics and also tapes
derived from the
cutting of those laminated sheets with thicknesses in the order of 3 to 10 mm,
as the thread
described in document EP1358370A1.
[0004] Some products are on the market, namely:
= Suberis consisting of a laminated structure/cork sheet with fabric or
non-woven
fabric, soft, washable, impervious and fireproof; being used for various
applications,
namely clothing, leather goods, the automotive area and furnishing and
decoration;
= Suberis thread - tape manufactured from a cork sheet with a width of 3
to 10 mm.
This tape in order to be used must bear a longitudinal seam manufactured with
synthetic thread or be twisted with other tape having in its interior (core) a
synthetic
thread to provide support to it;
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= Corkshell - textile structure with three layers wherein the cork (in
macro-grain scale)
is lodged in the intermediate layer of the fabric, having an exterior fabric
and an
interior fabric. It should be noted that upon analysis of a sample of this
structure the
consortium found that there is no chemical bonding between the cork granules
and
the various textile elements;
= Pelcor - the company presents a collection of accessories, in cork
leather, for different
situations, including purses, wallets, belts, umbrellas and various pouches;
= Artelusa - the company presents from products for office to purses and
wallets, belts
and diversified jewellery. It has no clothing;
= Nike Sportswear - it developed sneakers for basketball using genuine cork
to cover all
its outside;
= Dyn Cork (trademark of the company SEDACOR) owns cork fabrics, based on a
laminated sheet of natural cork. It further owns a cork thread obtained
through a cork
tape longitudinally seamed with a core of synthetic thread.
[0005] It has been found that the main applications of these products are
furnishing,
automotive upholstery, purses, wallets, belts, hats and small jewellery.
[0006] These products illustrate the technical problem to be solved by the
present solution.
General description
[0007] The analysis of the state of the art allows verifying that the current
market offer
concerning textile products and leather goods based on cork is mainly focused
on thin sheets
of natural or agglomerate cork usually, with a thickness in the order of
millimetres, laminated
with fabrics and non-woven fabrics and also tapes or threads from the cutting
of those
laminated sheets that afterwards were folded and seamed and have thicknesses
in the order
of 3 to 1.0 mm.
[0008] The products of the state of the art may be applied to furnishing
products, automotive
upholstery, purses, wallets, belts, hats and small jewellery. However, the use
of the products
in the textile industry namely clothing and household textiles is unknown,
since there are
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various related problems. Said problems are associated to the lack of
flexibility and
malleability of the cork sheets for use in clothing, which results in a
difficulty to fold them,
these becoming brittle; difficulties to seam these materials; lack of
breathability of the
material which makes it completely inadequate for use in clothing; not very
soft touch, as well
as problems with their conservation and cleaning, which limits their use in
the final products
of the textile cluster (clothing and household textiles). In relation to the
cork threads existing
in the market it can be observed that these are tapes derived from the cutting
of laminated
cork sheets, folded and seamed which makes them extremely thick, with low
malleability and
flexibility, that makes them impossible to process with the conventional
techniques of
manufacture of fabrics and knitted fabrics. Therefore, the use of the current
textile products
is made impossible, whether on clothing or household textiles, since their
performance versus
applicability is not satisfactory.
[0009] Within the scope of the present disclosure textile structure is
understood as a fabric,
non-woven fabric or knitted fabric from threads or natural or synthetic
fibres. Within the
scope of the present disclosure fabric is understood as any natural or
synthetic fibre thread-
based material used in the manufacturing of clothes, table linen, cleaning
cloths, medicinal
use like bands and bandages, among others. Therefore, the present disclosure
solves the
following problems:
= non-existence of textile substrates, in particular threads, fabrics, non-
woven fabrics
and knitted fabrics, with high incorporation of cork chemically bound to the
textile
substrate;
= lack of malleability, flexibility and thinness of the cork tapes to be
processed by the
conventional textile technologies, in particular knitting, weaving, among
others;
= lack of flexibility and malleability of the cork sheets for use in
clothing, which results
in a difficulty to fold them, these becoming brittle;
= difficulties in seaming the cork sheets;
= insufficient breathability of the cork sheets which makes them completely
inadequate
for use in clothing;
= not very soft touch of the cork sheets;
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= problems with the conservation and cleaning of the cork sheets, which
limits their use
in the end products of the textile cluster, in particular clothing and
household textiles.
[0010] The present disclosure introduces an innovative concept in relation to
textile materials
with cork, in particular threads, fabrics, non-woven fabrics and knitted
fabrics, since unlike
the currently existing products on the market that are obtained by collage of
fine sheets of
cork with a textile substrate. The cork thread, and the textile materials with
cork herein
disclosed incorporate a high quantity of cork in a reactive way, i.e.
chemically bound to the
textile substrate making them unique and differentiating products with regard
to the state of
the art.
[0011] Within the scope of the present disclosure thread-type structures
coated with
microparticles/granules of cork are developed, through processes of coating by
reactive
action. The present disclosure refers to textile threads, such as for example
cotton, linen,
wool, silk, polyamide, polyester, polyethylene, polyurethane and combinations
thereof,
which may be of natural fibre or synthetic fibre, said textile threads
comprising microparticles
of cork wherein these may bind to the textile thread through a binder.
[0012] One of the aspects of the present disclosure refers to a cork thread
comprising textile
thread of fibre (natural or non-natural, for example synthetic) and at least
2% of cork particles
(Pcork/Pfmal thread) and a polymeric binder to bind the cork particles to the
textile thread,
wherein the cork particles have a granulometry of size less than 1 mm.
Preferably at least 15%
of cork particles (pcork/Prinai thread); more preferably at least 20% of cork
particles
(Pcork/Pfinal
thread); even more preferably at least 25% of cork particles
(Pcork/Pfinal thread).
[0013] The weight of the final thread is the textile thread of fibre (natural
or non-natural, for
example synthetic) with the paste, i.e. weight of the thread, weight of the
cork particles,
weight of the binder and/or additives, among others.
[0014] The cork thread of the present disclosure may be woven when obtaining
structures of
knitted fabric or fabric, malleable, breathable wherein the obtained fabric
has features of
resistance, breathability, flexibility and improved lightness these features
being maintained
after washes. These new structures are specially adequate for clothing,
duvets, blankets and
other technical solutions due to the thermal/mechanical properties of the new
fabric.
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[0015] In an embodiment for better results, the cork threads may comprise
between 2% -
50% of cork particles in
,,cork, rin final thread), namely microparticles, in particular of 5 - 20% of
cork
particles (Pcork/Pfinal thread), 5 - 10% of cork particles (
,Pcork/Pfinal thread).
[0016] In the present disclosure, a thread is considered to be a set of
intertwined fibres,
forming a cylinder of irregular diameters along its length. This big
irregularity revealed in the
mentioned diameters becomes impossible to measure with a naked eye or, even,
with the
help of micrometric devices. These threads may be used for weaving, or
manufacturing
fabrics.
[0017] In an embodiment for better results, the cork threads herein disclosed
may be coated
with a coating bath or paste that may comprise from 5 to 50 g/I of a polymeric
binder selected
from the following list: thermoplastic resins, thermosetting resins; and/or
glyoxal resins,
namely: polyurethane, acrylate, isocyanates and polyoles.
[0018] In an embodiment for better results, the cork threads, fixatives,
thickeners, softeners,
stabilizers, colorants may further be used.
[0019] In an embodiment for better results, the incorporation of a quantity of
cork additives
has been obtained (or cork particles) in the textile substrates, in particular
cork threads, with
a percentage of additives/cork particles 18%,
(Pcork/Pfinal thread), and another percentage of
to SO% (pcodpfinai thread) in the fabrics and knitted fabrics.
[0020] In an embodiment, the cork thread described in the present disclosure
obtained an
increase of the breaking and elongation strength, in particular N (Newton)
7.8%
comparatively to a fabric produced with the same thread but without cork.
[0021] In an embodiment, the cork thread described in the present disclosure
obtained an
increase of the pilling (from Portuguese borboto) resistance comparatively to
a fabric
produced with the same thread but without cork.
[0022] In an embodiment, with the cork thread described in the present
disclosure an
increase of the washing resistance above 20 cycles was obtained, carried out
in particular at
40 C.
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[0023] In an embodiment, with the cork thread described in the present
disclosure an
increase of the malleability and flexibility of the textile substrates of
fabrics, non-woven
fabrics and knitted fabrics was obtained, comparatively to a tape or cork
cord.
[0024] In an embodiment, the cork thread described in the present disclosure
obtained an
increase of the malleability, flexibility and thinness of the cork textile
threads that allowed
their processing through conventional technologies for the obtention of
fabrics and knitted
fabrics.
[0025] In an embodiment, with the cork thread described in the present
disclosure it was
possible to obtain the easiness to seam (from Portuguese costurobilidade) of
the fabrics and
knitted fabrics.
[0026] The products developed and resulting from the use of the cork thread
described in the
present disclosure have several advantages over the products already existing
in the market,
namely the following:
= in the case of fabrics, non-woven fabrics and knitted fabrics they have
advantage in
terms of flexibility, breathability and easiness to seam, possibility of
washing without
deformations, in particular up to 40 washes and antibacterial character;
= in the case of the threads these have a thickness and flexibility
suitable for textile
processing, contrary to the current state of the art, thus permitting the
production of
new textile substrates and products, non-existing in the current market;
= good performance of the fabrics developed with the cork thread with
regard to the
dimensional stability, pilling resistance, breaking and elongation strength
and
thickness;
= breaking and elongation strength (N): it increased 7.8% comparatively to
a fabric
produced with the same thread but without cork;
= pilling resistance: it increased around 0.5% (on a scale of 0 to 5)
comparatively to a
fabric produced with the same thread but without cork;
= the fabric with cork is respirable and by comparison with a similar
fabric though
without cork, it has a resistance to the water vapour about 9% less (this
means that it
is more breathable);
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= thermal resistance (Rct) 0.750 (m2.K/W) - midseason duvet;
= good dimensional stability to wash,
= thinness suitable to its use in textile articles;
= they may be easily seamed in conventional machines maintaining the
flexibility of a
fabric without cork.
[0027] It should be added that the use of the cork particles instead of using
cork sheets, as it
is disclosed in the state of the art, also has a character of reuse and better
use of subproducts
and as a consequence they may have a more affordable price, while at the same
time it
promotes the concept of eco-friendly and sustainability.
[0028] In an embodiment, the granulometry of the cork used in the present
disclosure may
vary between 0.001 and 0.85 mm, preferably between 0.4-0.7 mm.
[0029] The measurement of the granulometry/particle size/cork granule may be
carried out
in various ways, in this disclosure the measurement granulometry/particle size
was carried
out on the basis of the standard the granulometry analysis by mechanical
sieving, namely the
one described by NP ISO 2030 of June, 2011. In particular concerning the sizes
of the particles
obtained by the sieves specified in item 4.1.2 whose openings are in
accordance with series
ISO/R 40/3 (see ISO 565 of 1990).
[0030] The present disclosure allows obtaining with the cork thread described
a product in
which the features of the textile are maintained while simultaneously it is
possible to increase
the breaking resistance and the increase of the elongation, the dimensional
stability and the
antibacterial activity of the textile with cork, and also the resistance to
the thermal variations.
[0031] The present disclosure relates to a cork thread of natural or non-
natural fibre, e.g.
synthetic, comprising at least 2% of cork particles
(p cork/Pfinal thread) and a suitable polymeric
binder that binds the cork particles to the textile thread wherein the cork
particles comprise
a granulometry less than 1 mm.
[0032] One of the aspects of the present invention relates to a cork thread
comprising textile
thread of fibre (natural or non-natural) and at least 2% of cork particles
(Pcork, Pfinal thread) and
a polymeric binder for binding the cork particles to the textile thread
wherein the cork
particles have a granulometry of size less than 1 mm.
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[0033] In an embodiment, the cork thread herein disclosed has a linear
density, measured in
tex less 197 tex (Ne 3/1), preferably less than 118 tex (Ne 20/1), even more
preferably
between 15x2 tex (Ne 40/2) and 40x2 tex (Ne 30/2), in particular 30x2-33x2tex
(Ne 20/2 ¨ Ne
36/2).
[0034] In an embodiment, the linear density resulting from the cork threads
may refer to a
single thread or with 2 or more twisted cables. Threads formed by two or more
threads (or
cables), which have been twisted with each other, are named twisted threads.
[0035] Usually, the linear density of a textile thread is represented by a
number that
expresses a relation between a given length and the corresponding weight. The
tex linear
density of a thread is equal to the weight in grams of 1000 metres of thread.
Such is the
representation recommended by the International System of Units (SI), since
the length is the
measure of 1000 metres of material. Therefore the material that presents mass
of 1 gram in
such length, will have as linear density 1 tex and so forth. The Number
English (Ne) of a thread
is equal to the number of bundles of 840 yards (768 metres) each, necessary to
obtain the
weight 1 pound (r: 454 grams). In the Decimal System the Number English of a
cotton thread
is equal to the number of bundles of 768 metres each, necessary to obtain a
weight of 454
grams.
[0036] In an embodiment for better results, the cork thread herein disclosed
may comprise
at least 5% of cork particles (PcordPfinal thread), at least 10% of cork
particles ,P( cork,/
Pflnal thread),
preferably at least 15% of cork particles µP( cork, rin
final thread), even more preferably at least 20%
of cork particles ,P( cork,/ Pfinal thread).
[0037] In an embodiment for better results, said cork particles may present a
granulometry
less than 0.85 mm, preferably less than 0.8 mm.
[0038] In an embodiment for better results, said cork particles may further
present a
granulometry between 0.001-0.5 mm, preferably between 0.05-0.5 mm.
[0039] In an embodiment for better results, the suitable polymeric binder that
binds the cork
particles to the textile thread may comprise polyurethane, or acrylate, or
combinations
thereof, among others.
[0040] In an embodiment for better results, said binder may be selected from
the following
list: thermoplastic resins, namely PVC, PU; thermosetting resins, in
particular polyvinyl
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chloride, polyvinyl acetate, acrylic polyesters, polystyrene, polyethylene,
polyamide,
polyurethane; glyoxal resins; waxes; paraffins; silicones; and combinations
thereof, among
others.
[0041] In an embodiment for better results, the thread herein disclosed may
further comprise
fixatives, thickeners, softeners, stabilizers, colorants, or combinations
thereof.
[0042] In an embodiment for better results, the textile thread may be selected
from a list
constituted by cotton, linen, wool, silk, viscose, acetate, polyamide,
polyester, acrylic,
elastane, polyethylene, polyurethane and combinations thereof, among others.
[0043] The present disclosure further refers to a knitted fabric or a fabric
that may comprise
the cork thread herein disclosed.
[0044] The disclosure further relates to a composition for coating bath or
paste for a coating
of the textile thread described herein disclosed. Said composition for coating
bath or paste
may comprise 5 to 50 g/I of a suitable polymeric binder and 5 to 100 g/I of
cork particles with
a granulometry less than 1 mm, preferably 10 to 40 g/I of a suitable polymeric
binder and 20
to 70 g/I of cork particles, even more preferably of 20 to 30 g/I of a
suitable polymeric binder
and 40 to 60 g/I of cork particles.
[0045] In an embodiment, the composition herein disclosed may comprise cork
particles
comprising a granulometry less than 0.85 mm, preferably less than 0.8 mm.
[0046] In an embodiment, the composition herein disclosed may comprise cork
particles
comprising a granulometry with sizes between 0.001-0.5 mm, preferably between
0.05-0.5
mm.
[0047] In an embodiment, the binder may comprise polyurethane, or acrylate, or
combinations thereof, among others.
[0048] In an embodiment, said binder may be from the following list:
thermoplastic resins,
namely PVC, PU; thermosetting resins, in particular polyvinyl chloride,
polyvinyl acetate,
acrylic polyesters, polystyrene, polyethylene, polyamide, polyurethane; glyoxa
I resins; waxes;
paraffins; silicones; and combinations thereof.
[0049] In an embodiment, the composition may further comprise fixatives,
thickeners,
softeners, stabilizers, colorants, or combinations thereof, among others.
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[0050] The present disclosure further refers to a fabric, a knitted fabric and
a non-woven
fabric coated with the composition described previously.
[0051] The disclosure concerned is also related to articles that may comprise
textile
materials, threads, fabric, knitted fabric and non-woven fabrics described
previously, and
the articles may comprise decoration articles, bed linen, blankets,
mattresses, curtains,
clothing and/or technical articles, among others.
[0052] The present disclosure also relates to a process for depositing the
cork particles in
a textile structure, knitted fabric or non-woven fabric, and that may comprise
the
following steps, namely deposition of a coating bath or paste by knife coating
on said
textile, knitted fabric or non-woven fabric structures.
[0053] In an embodiment, the process herein disclosed may further comprise one
step of
drying and/or setting, preferably a step of thermosetting.
[0054] The present disclosure also relates to a process for depositing the
cork particles
onto the textile thread and it may comprise a step of passing the thread
through a coating
bath or paste, by ecloning, spraying or immersion, and said process may
further comprise
a step of drying and/or setting, preferably thermosetting.
[0054a] In another aspect, there is provided a weavable or knittable cork yarn
comprising
textile yarn of natural or synthetic fibre and at least 2% of cork particles
W.. fwt ,-/ t x ¨cor, final yarn)
and a polymeric binder for binding the cork particles to the textile yarn,
wherein the cork
particles have a granulometry of size less than 1 mm wherein the linear
density of the cork
yarn is less than 197 tex.
[0054b] In another aspect, there is provided a knitted fabric or woven fabric
comprising
the cork yarn as described herein.
[0054c] In another aspect, there is provided a composition for coating bath or
paste of the
cork yarn as described herein, the composition comprising: 5 to 50 g/I of a
polymeric
binder; and 5 to 100 g/I of cork particles with a granulometry less than 1 mm.
[0054d] In another aspect, there is provided an article comprising the
weavable or
knittable cork yarn as described herein or the knitted fabric or woven fabric
as described
herein.
Date Recue/Date Received 2023-04-17
[0055] Throughout the description and claims the word "comprises" and
variations
thereof, are not intended to exclude other technical features, as other
components, or
steps. Additional objects, advantages and features of the disclosure will
become clear to
those skilled in the art after the examination of the description or may be
learned by
practice of the invention. The following embodiments are for illustrating the
description
and should not be seen as limiting the scope of the disclosure. Furthermore,
the present
disclosure covers all possible combinations of specific or preferential
embodiments herein
described.
Brief description of the figures
[0056] The following figures provide preferred embodiments for illustrating
the
description and should not be seen as limiting the scope of the disclosure.
[0057] Figure 1: Representation of a coating of a textile structure of a
fabric, knitted fabric
and non-woven fabric with the composition described in the present disclosure.
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[0058] Figure 2: A and B represent different perspectives of a process for the
coating of the
textile thread with the composition described in the present disclosure.
[0059] Figure 3: Representation of an embodiment of the present disclosure
wherein A
represents a view of the textile thread without paste and B represents a view
of the cork
thread of the present embodiment, i.e. textile thread with cork coating and
cross-section AA
of the thread coated with cork covering paste.
Detailed description
[0060] The present disclosure relates to the application of different
technological processes
that resorted to technologies of superficial chemical deposition, namely
coating by reactive
action. The solutions obtained by adopting the preconized research process
are: type-thread,
fabric, non-woven fabric and knitted fabric structures, in particular of
natural or non-natural
origin, in particular synthetic or artificial and coated with cork
microparticles/micro-
fines/gra nules.
[0061] It is an innovative concept in relation to textile materials with cork,
in particular
threads, fabrics, non-woven fabrics and knitted fabrics, since unlike the
currently existing
products on the market that are obtained by collage of thin sheets of cork
with a textile
substrate, these incorporate high quantity of cork in reactive form, i.e.
chemically bound to
the textile substrate, making them unique and differentiating products with
regard to the
state of the art.
[0062] In an embodiment, the following processes may also be used: exhaustion,
immersion
and/or spraying.
[0063] In an embodiment, the following methodology was adopted:
= preparation of formula of the coating bath/paste of cork
microfines/granules, since
the cork alone is not capable of creating bonds of chemical nature with the
textile
substrates whether they are of natural origin or synthetic, there is the need
to prepare
coating baths and pastes that allow the stable chemical bond between the cork
micro-
additives and the textile substrates;
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= coating baths/pastes have been formulated resorting either to the
conventional resins
and additives, namely glyoxal resins, thermoplastic resins (PVC, PU, etc.),
thermosetting resins, in particular polyvinyl chloride, polyvinyl acetate,
acrylic
polyesters, polystyrene, polyethylene, polyamide, polyurethane, among others,
and
other functional additives, for example waxes/paraffins, silicones, among
others;
= bond between the cork bath/paste and the textile substrates through the
coating
technology by reactive action, that consists of deposing a polymer in the
textile
structure to be processed.
[0064] In an embodiment, the composition of the coating bath/paste may
comprise: cork
additive, binder, fixative and thickener.
[0065] In an embodiment, the coating process of the fabric, knitted fabric and
non-woven
fabric structures is carried out according to figure 1, wherein after the
preparation of the
coating bath/paste this one is deposited on the surface through knife coating
technology in a
quantity necessary to obtain in the end a value of cork additive (cork
particles) more than 10%
(Pcork/Pfinal thread). Then the coated structure is subject to drying and
thermosetting with dry
heat (drying machine/stentering machine) during the time necessary for its
effective setting.
[0066] In an embodiment the coating process, of thread is carried out
according to figure 2.
The bath/paste is prepared and placed in the vat of the thread coating
machine. Then, the
raw threads are forced through the vat and "dragged" between 2 rollers of
controlled
pressure so as to guarantee the superficial deposition of bath uniformly and
in a quantity
necessary to finally obtain a percentage of more than 2% of cork particles
(Pcork/Pfinal thread).
Then the threads are guided between 2 heated rollers where pre-drying takes
place and
subsequently coiled when exiting the machine. After coating, the thread can be
softened by
exhaustion in an autoclave-type equipment.
[0067] In an embodiment the processes of application of the coating bath/paste
to the textile
substrates, as well as its processing parameters, temperature, pressure, time,
speeds, among
others, have also to be adjusted so as to guarantee the quality of the textile
substrates with
incorporation of cork. The processing conditions, both in terms of application
technology, and
in terms of parameters, are different for the various substrates, in
particular thread, fabric,
non-woven fabric and knitted fabric. In an embodiment, in case there are
constraints that
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prevent the success of this solution there will also be used processes of
prior preparation
of the materials through the superficial modification promoted by plasma,
ozone,
ultrasounds, ballooning with isopropanol or toluene among others. These
treatments help
cleaning and activating and adding functionality to the surface of the textile
substrates,
making them more able to bond chemically.
[0068] Another process of applying the pastes may be through spraying.
[0069] An example of the present disclosure is presented below. The processes
of
application of the bath/paste to the textile substrates, as well as its
processing
parameters, temperature, pressure, time, speeds, among others, have also to be
adjusted
so as to guarantee the quality of the textile substrates with incorporation of
cork.
[0070] The processing conditions, both in terms of application technology, and
in terms
of parameters, were different for the threads and for the remaining
substrates, in
particular fabric, non-woven fabric and knitted fabric.
[0071] In an embodiment, in the case of fabrics, non-woven fabrics and knitted
fabrics a
cold-end coating made by knife coating and subsequent drying treatment at 100
C and
thermosetting at a temperature of approximately 160 C may be carried out.
[0072] In an embodiment, in the case of the textile thread, a cold-end coating
may be
carried out in a thread coating machine followed by a thermal treatment, in
particular
drying, in the same equipment through heated rollers.
[0073] The products obtained incorporate high quantity of cork in a reactive
way, i.e.
chemically bonded to the textile substrate, making them unique and
differentiating
products with regard to the state of the art.
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Date Recue/Date Received 2023-04-17
